Add 'Used Extensively in Bookbinding'

Used-Extensively-in-Bookbinding.md

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+<br>Used extensively in bookbinding, a board shear is a big, hand-operated machine for cutting board or  [Wood Ranger shears](https://wiki.anythingcanbehacked.com/index.php?title=Hydraulic_Rescue_Tool) paper. Like scissors, a board shear makes use of two blades to apply shear stress exceeding the paper's shear strength in order to chop. The stationary blade forms the edge of the reducing desk, with the moving blade mounted on a reducing arm. Originally referred to as a desk gauge shear as a result of its gauge allowed the reducing of persistently-sized materials, the board shear resembles a bigger model of the paper cutters generally found in workplaces. The earliest known reference to a board shear comes from an 1842 complement to Penny Magazine, titled A Day at a Bookbinder's, which included a drawing of a board shear with lots of the most important developments already current. Middleton, Bernard (1996). A History of English Craft Bookbinding Technique. Oak Knoll Press & The British Library. Harrison, Gary. "Board Shear". This text about making art out of books, the arts associated to bookbinding, or the design of mass-produced books is a stub. You may help Wikipedia by increasing it.<br>
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+<br>Viscosity is a measure of a fluid's rate-dependent resistance to a change in shape or to movement of its neighboring parts relative to each other. For liquids, it corresponds to the informal concept of thickness